I have an Alien and a G-Priv 220, really like both, but which I use depends on where I am and what I am doing. Alien is a nice fit in the hand and better for out and about. I love the G-Priv mostly for the touch screen and ease of menu navigation. Not sure about any negatives that
@SteveS45 is referring to, but my only "complaint" if you will is the screen may be too easy to lock/unlock.
Same holds true for all the TFV tanks available. I have a TFV4, two TFV4 minis, a TFV8, a TF RTA G2, a baby beast, and a Big Baby. Obviously, I like the Smok tanks.

Different tanks just seem to work better with different mods and moreso, different juices. But all work quite nicely. About the only suggestion I would give is to go with the Big Baby over the Baby Beast for the larger tank which is the only benefit to me. But the Baby Beast is rather nice if one wants to try different flavors somewhat regularly. I really don't know anything much about the TFV12 since the TFV8 provides everything I like at the higher power required which already limits my battery life and limits.
I guess I could have just said you can't go wrong with any of them. Pick one and enjoy!
